LTC3252

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Dual, Low Noise, Inductorless Step-Down DC/DC Converter

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Overview

  • 2.7V to 5.5V Input Voltage Range
  • No Inductors
  • Typical Efficiency 50% Higher than LDOs
  • Spread Spectrum Operation
  • Low Input and Output Noise
  • Shutdown Disconnects Load from VIN
  • Dual Adjustable Independent Outputs (Range: 0.9V to 1.6V)
  • Output Current: 250mA Each Output
  • Low Operating Current: IIN = 60µA Typ (35µA with One Output Enabled)
  • Low Shutdown Current: IIN = 0.01µA Typ
  • Soft-Start Limits Inrush Current at Turn On
  • Short Circuit and Over Temperature Protected
  • Available in 4mm x 3mm 12-Pin DFN Package

The LTC3252 is a switched capacitor step-down DC/DC converter that produces two adjustable regulated outputs from a single 2.7V to 5.5V input. The part uses switched capacitor fractional conversion to achieve a typical efficiency increase of 50% over that of a linear regulator. No inductors are required.

A unique constant frequency, spread spectrum architecture provides a very low noise regulated output as well as low noise at the input. The part also has Burst Mode® operation to provide high efficiency at low output currents, as well as ultralow current shutdown.

Low operating currents (60µA with both outputs enabled, 35µA with one output enabled) and low external parts count make the LTC3252 ideally suited for space-constrained battery-powered applications. The part is shortcircuit and overtemperature protected and is available in a tiny 4mm x 3mm 12-pin DFN package.

Applications

  • Handheld Electronic Devices
  • Cellular Phones
  • Low Voltage Logic Supplies
  • DSP Power Supplies
  • 3.3V to 1.5V Conversion
LTC3252
Dual, Low Noise, Inductorless Step-Down DC/DC Converter
1.5V and 1.2V Output Voltages with Shutdown 1.5V/1.2V Efficiency vs Input Voltage Product Package 1
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Documentation

Data Sheet 1

Reliability Data 1

User Guide 1

Technical Articles 2

Data Sheet

This is the most up-to-date revision of the Data Sheet.

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Software Resources

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Tools & Simulations

LTspice

Models for the following parts are available in LTspice:

  • LTC3252
LTspice

LTspice® is a powerful, fast and free simulation software, schematic capture and waveform viewer with enhancements and models for improving the simulation of analog circuits.

Evaluation Kits

eval board
schematic 1
DC611A

LTC3252EDE Demo Board | Dual, Spread-Spectrum, Low Noise Inductorless, Step Down Charge Pump, 2.7V ≤ VIN ≤ 5.5V, VOUT1 = 1.5V @ 250mA, VOUT2 = 1.2V @ 250mA

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Product Details

Demonstration circuit 611 is a dual, spread-spectrum, step-down charge pump DC/DC converter featuring the LTC3252EDE. It produces regulated 1.5V and 1.2V output voltages at up to 250mA of output current each, from a 2.7V to 5.5V input. The unique spread spectrum architecture of the LTC3252 provides highly efficient, low noise operation. The circuit has a low external parts count and requires only five small surface mount capacitors and four tiny surface mount resistors.
DC611A
LTC3252EDE Demo Board | Dual, Spread-Spectrum, Low Noise Inductorless, Step Down Charge Pump, 2.7V ≤ VIN ≤ 5.5V, VOUT1 = 1.5V @ 250mA, VOUT2 = 1.2V @ 250mA
DC611A - Schematic

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